Packing for pumps



June 19 1,539,941

D. B. GENTRY PACKING FOR PUMPS Filed Dec. 29, 1923 inventor Dough 4513. Gmi r y Patented June 2, 1925.

UNITED STATES PATENT OFFICE,

IDOUGLAS B. GENTRY, or-cnozn'r, VIRGINIA, ASSIGNOR OF-.ONE-HALF T Banner 2.

GENTRY, or CROZET, VIRGINIA.

PACKING ron PUMPS.

Application filed December 29, 1923. Serial No. 683,365.

To all whom it may concern:

Be it known that I, DOUGLAS B. GENTRY, a citizen of the United States, residing at Crozeflin the county of Albemarle and State of Virginia, have invented certain new and useful Improvements in Packings Pumps, of which the following is a specification.

This invention relates to certain new and useful improvements in packing for pumps and it has for its objects among others, to provide a simple and efficient device for this purpose which will dispense with all types of packing for this form of pump, the same embodying a revoluble member having spiral flutes which serves to force back any liquids that may leak through between the shaft and its hearing. I also provide a liquid and air tight joint which further aids in holding back all liquids that leak through between the shaft and its bearing.

Other objects and advantages of the invention will hereinafter appear, and the novel features thereof will be specifically defined by theappen-ded claims.

The invention, in its preferred form, is clearly illustrated in the accompanying drawings, which, with the numerals of reference marked thereon, form a part of this specification, and in which Figure 1 is a longitudinal section through the parts comprislng my present invention. I

Figure 2 is a cross section thereof, as on the line 2-2 of Figure 1, looking in the direction of the arrows.

Figure 3 is a detail in plan showing one of the governor arms.

Like numerals of reference indicate like parts throughout the several views.

It has been deemed unnecessary to, show any particular form of centrifugal pump, or to enter into a detail description of the same, further than to say that the invention is applicable to any and all forms of such or other pumps in which is employed a rotary shaft such as 1, and the following description thereof will thereforebe confined to "such parts as cooperate with my present invention.

The shaft 1 has a shoulder or collar 2, as seen in Figure 1, and fast upon this shaft, keyed or otherwise, is a worm cone 3 having for spiral flutes 4, substantially one quarter of an inch wide and substantially a quarter of.-

an inch deep, the said flutes running in a direction opposite to the direction of revolution of the shaft, for a purpose which will soon be made apparent, it being understood that these flutes serve to catch any liquid that may leak through between the shaftand its bear ng, soon to be described, and throw it back into the pump from whence it came. 5 is a cup keyed tothe shaft 1 with a sliding ht so as to be capable of movement in the direction of the length of the shaft under condltlons which Will soon be explained.

The outer end of this cup is formed with an internal shoulder 6, and to the other end of this cup is bolted a disc 7 of rubber or anal0- gous material, which is backed up by a metallic d sc 8, the securing bolts 9 being headed in the metal disc as seen in Figure 1 at 10, and provided upon their outer ends witlrnuts 11, as shown clearly in Figure 1.

lVitlnn the cup 5 is a spring 12 confined between the shoulder or collar 2 on the shaft 1 and the shoulder (3 on the cup as clearly shown in Figure 1.

13 is the pump casing and 14 the shaft bearing, of the usual or any preferred form of construction.

15 is a packing gland having a shoulder 16 entending inwardly and shoulder 17 extending outwardly, or in the opposite direction, as shown clearly in Figure 1, The casing and the gland have coincident holes 18 and 19 in their flanges 20 and 21, for the reception of bolts by which they are secured together, while the flange 21 of the gland 1s provided with screw threaded holes 22 for the reception of adjusting screws for adpistmg the shoulder 16 against the disc 7 v as Wlll be readily understood from Figure 1.

23 is a soft rubber ring or gasket con fined between the shoulder 17 of the gland and a shoulder 24 on the casing 13 as seen in Figure 1. This ring or gasket is pressed by the shoulder 17 of the packing gland and forms a liquid and air tight joint at this point.

As seen in Figure 1 the inner end 25 is received in the annular space 26 formed in" the outer face of the bearing 14. It is to be noted thatthere is a space 27 between the metal disc 8 and the adjacent face or end of the worm cone 3, for a purpose which will soon appear.

Keyed to the shaft 1 is a overnor ring 28 having oppositely dis osed ugs 29 in which are mounted pins or t 1e like 30 on which are mounted for pivotal movement the governor arms 31 carrying the governor balls 32, the said arms having fingers or the like 33 which work in the space 34 between the adjacent faces of the cup 5 and the ring 28 and bear against the outer end of the cup.

With the parts constructed and arranged substantially as above described the operation, brieflystated, is as follows :\Vhen the shaft 1 revolves, to ether with 'the worm cone 3, cup 5, the discs 7 and 8 and the governor ring 28, the governor arms 31 expand and push the cup 5 toward the worm cone, compressing the spring 12 and at the same time breaking the contact of the disc 7 against the shoulders 2 and 16. Any) liquid that leaks through from the pump etween the shaft 1 and its bearing 14 will be caught up by the spiral flutes 4 of the worm cone 3 and, by such flutes, forced back between the "shaft 1 and the bearing 14 'into the pump.

When the pump stops the governor arms are forced inward toward the shaft 1 by the expansion of the spring which also pushes the cup 5 back to its normal position and makes a contact between the rubber disc 7 and the shoulders 2 and 16, thus forming a liquid and air tight joint which serves to hold any liquid that might otherwise leak out, as it leaks through between the shaft 1 and its bearing 14. The operation is entirely automatic and is reliable and efficient. The parts are simple in their nature, readily applied, not liable to get out of order, and can be manufactured at small cost.

Modifications in detail may be resorted to without departing from the spirit of the invention or sacrificing any of its advantages.

The overnor serves to release all friction when tie pump is in operation and opens the gasket on the cup. \Vhen the pump stops the governor closes, making a tight joint on the shaft and packing gland. When the pump is still'the governor stands at about thirty degrees and when in full run ning force it stands at about ninety degrees. The gasket being attached to the cup through the medium of the bolts'is released when the governor takes hold while running. The cup opens the gasket when in, operation to release friction from the gland.

In order to get centrifugal force the spiral flutes must be opposite to the rotation of the shaft, that is the shaft runs to the right while the flutes run to the left. The fluted cone and'the gasket are cooperable and add .materially to the attainment of the desired result. When the device is in operation the fluted cone acts by itself, but when in operation and the fluted cone revolving the gasket is pulled back by the spring against the gland and prevents leakage while not running.

' What is claimed as new is 1. In a rotary pump, a pump shaft, a cone mounted on said shaft to revolve therewith operable in conjunction with said cone.

3. In a centrifugal pump, the combination with its shaft, of a cone mounted to revolve with said shaft, and having spiral flutes o erable in a direction opposite to the directron of revolution of the s iaft, a bearing for said'shaft having a conical socket for said cone, overnor-controlled means operable in (5011]11110121011. with said cone, and means controlled by the said governor-controlled means for forming a liquid and air tight joint about said shaft.

4. In a centrifugal pum the combination with its shaft, of a spira y fluted cone for automatically returmng to the ump any liquid leaking between the shaft and its bearin a bearing for the shaft having cone shape socket to receive said cone, and governor-controlled means formin and air tight joint about said sha t.

5. In a centrifugal pump, the combination with its shaft, of a spirally fluted cone for automatically returning to the pump any bearing, a bearing for the shaft having cone jointabout the shaft, said means embodying a liquid liquidleaking between the shaft and its a governor-controlled cupped member on the shaft normally engaged by a shoulder on the shaft.

6. In a centrifugal pump, the combination with its shaft, of a spirally fluted cone for automatically returning to the ump any liquid leaking between the shart and its bearin ,-a bearing for the shaft having a cone s a ed socket for the cone, governorcontrolle means forming a li uid and air tight joint about the shaft, sai means'em bodying governor-controlled means on the shaft enga ed by a shoulder on the shaft, and a pac ing member between the cone and shoulder.

7 In a centrifugal pump, the combination with its shaft, of a spring actuated cup shaped member on the shaft, a spirally fluted cone, a shaft bearing having a conical depression to receive said cone, a packing disc normally abutting a shoulder on the shaft and movable out of contact therewith by the action of governing means and centrifugal force.

8. In a centrifugal pump, the combination with its shaft, of a spring actuated cup shaped member slidable on said shaft, a spirally fluted cone, a shaft bearing having a conical depression for said cone, a pack ing disc normally abutting ashoulder on said shaft and movable out of contact therewith by the action of governor means and centrifugal force, and a governing means to which centrifugal force is given by the rotation of said shaft.

contact with a shoulder on the shaft, and

packing means upon opposite sidesof said gland.

10. In a centrifugal pump, the combination with'its shaft, of a cup slidable thereon, a packing gland within which it is movable, a cone on the shaft having spiral flutes, a disc embracing the shaft and normally in contact with abutting means on the shaft, packing means on the shaft, upon opposite sides of the gland, and said cup forming governor controlled means actuated by the centrifugal force produced by the rotation of the shaft.

In testimony whereof I afiixmy signature.

- DOUGLAS B. GENTRY. 

